.text-center, .nav-wrapper nav, .tabbar-wrapper .tabbar {
  text-align: center;
}

.nav-wrapper {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 2.5rem;
}

.nav-wrapper nav {
  height: 2.5rem;
  background-color: red;
  line-height: 2.5rem;
  border-bottom: 1px solid black;
}

.content-wrapper {
  width: 100%;
  height: 100%;
  padding: 2.5rem 0 3rem;
}

.content-wrapper .content {
  height: 100%;
  background-color: green;
}

.tabbar-wrapper {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3rem;
}

.tabbar-wrapper .tabbar {
  height: 100%;
  background-color: gainsboro;
  line-height: 3rem;
}
